Meaning of “sneak” in the English Dictionary

"sneak" in British English

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uk /sniːk/ us /sniːk/ sneaked or US also snuck, sneaked or US also snuck

sneak verb (MOVE SECRETLY)

C2 [ I or T, usually + adv/prep ] to go somewhere secretly, or to take someone or something somewhere secretly:

I managed to sneak in through the back door while she wasn't looking.
Jan doesn't have a ticket but I thought we might sneak her in.
I thought I'd sneak up on him (= move close to him without him seeing) and give him a surprise.

sneak verb (TELL SECRETLY)

[ I ] UK slang disapproving to secretly tell someone in authority, especially a teacher, that someone else has done something bad, often in order to cause trouble:

She was always sneaking on other kids in the class.

sneaknoun [ C ]

uk /sniːk/ us /sniːk/ UK slang disapproving

a person who tells people in authority when someone else does something bad:

You told Mrs Cooper that it was me who tipped the paint over, didn't you - you nasty little sneak!

(Definition of “sneak” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"sneak" in American English

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sneakverb [ always + adv/prep ]

us /snik/ past tense and past participle sneaked or snuck /snʌk/

to go or do something secretly, or take someone or something somewhere secretly:

[ I always + adv/prep ] He sneaked out of the house, going out through the back way.
[ T ] I sneaked a look at my watch.
[ T ] Make sure you sneak a little bit of protein into your snacks.
[ I always + adv/prep ] He snuck out of the budget meeting and went back to the lab.

Phrasal verb(s)

(Definition of “sneak” from the Cambridge Academic Content Dictionary © Cambridge University Press)